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How to :: add php extension in windows server

The default location PHP searches for extensions is C:\php4\extensions in PHP 4 and C:\php5 in PHP 5. To change this setting to reflect your setup of PHP edit your php.ini file:

You will need to change the extension_dir setting to point to the directory where your extensions lives, or where you have placed your php_*.dll files. For example:

extension_dir = C:\php\extensions

Enable the extension(s) in php.ini you want to use by uncommenting the extension=php_*.dll lines in php.ini. This is done by deleting the leading ; from the extension you want to load. Example 6-8. Enable Bzip2 extension for PHP-Windows

// change the following line from ...
;extension=php_bz2.dll

// ... to
extension=php_bz2.dll

Some of the extensions need extra DLLs to work. Couple of them can be found in the distribution package, in the C:\php\dlls\ folder in PHP 4 or in the main folder in PHP 5, but some, for example Oracle (php_oci8.dll) require DLLs which are not bundled with the distribution package. If you are installing PHP 4, copy the bundled DLLs from C:\php\dlls folder to the main C:\php folder. Don't forget to include C:\php in the system PATH (this process is explained in a separate FAQ entry).

It's basically a matter of making sure that the required DLL is in place and the correct settings are in php.ini. Make sure the extension_dir specifies the correct location of php_gd2.dll, and then uncomment the line extension=php_gd2.dll.